Lycoming IO-390-D Series Maintenance Manual page 44

25-Hour Engine Inspection Checklist for IO-390-D Series Engines (Cont.)
Inspection Item
WARNING
EXAMINE THE OIL PRESSURE SCREEN OR THE FILTER ELEMENT OF
THE OIL FILTER FOR UNWANTED METAL PARTICLES. CLEAN THE
OIL PRESSURE SCREEN. A CLOGGED OIL PRESSURE SCREEN CAN
CAUSE ENGINE FAILURE.
Remove, examine, clean and
install the oil pressure screen (or
replace the oil filter on the initial
oil change).
WARNING
EXAMINE THE OIL SUCTION SCREEN FOR UNWANTED METAL
PARTICLES. REMOVE ANY CLOGS OR BLOCKAGES IN THE SUCTION
SCREEN.
Remove, examine and clean the
oil suction screen at the oil sump;
install the oil suction screen.
Examine the engine for fuel or
oil leaks.
NOTICE: During the first
hours of service, engines can
have some leakage at the
cylinder base. This initial leakage
is not harmful or detrimental to
the engine.
Examine the engine for dirt,
particulate, sand, or other
contamination.
Re-torque the exhaust flange nuts
after the first 25-hours of engine
operation.
05-20
Page 18
IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Comments
Refer to the section in Chapter 12-
10: "Oil Pressure Screen
Removal/Inspection/Cleaning/
Installation" or "Oil Filter
Replacement."
If blockage is found, record and
identify the blockage (metal,
carbon, etc.)
Remove any blockage and clean
the oil suction screen. Refer to the
section "Oil Suction Screen
Removal/Inspection/Cleaning/
Installation" in Chapter 12-10.
Complete the "Oil Leak Check"
procedure in Chapter 12-10.
Remove any dirt, particulate,
sand, or other contamination per
Chapter 5-30.
Refer to Chapter 78-00.
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Results/Notes Done
March 2020